Does anyone else have problems disentangling themselves from people?

Every once in a while I find myself involved with people who trouble me, but who I can't seem to shake.

I think mostly it's because I truly want to get along with people, and yet some of those people don't appear to be rational. They would rather yell and cause problems. And if you try to disentangle yourself, they will retaliate and do everything they can to continue the relationship, but on their terms.